Ford Corsar Repair Manual page 177

E.C.C.S. DESCRIPTION
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E.C.C.S. Components
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CAZOE
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MIXTURE RATIO FEEDBACK
This system utilizes an exhaust gas sensor located in the exhaust manifold to monitor whether the air fuel ratio is
richer or leaner than the stoichiometric point (14.7: 1 air/fuel mix).
The control unit then adjusts the injection pulse width according to the sensor output signal, to maintain the mixture
ratio within a narrow window around the stoichiometric point.
To maintain optimum engine operation, the mixture ratio feedback system does not operate under the following
conditions:
when starting the engine
when the exhaust gas is cold
when the engine coolant is below 60°C
when the engine speed is above 3800 rpm
when the engine speed is below 3800 rpm and engine load is above a pre-determined rate
when engine is idling for more than approximately 20 seconds
when throttle position changes faster than a pre-determined rate (ie) acceleration or deceleration
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When in operation, the mixture ratio feedback control system is said to be in the closed loop condition.
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Conversely, when not in operation, the mixture ratio feedback control system is said to be in the open loop
condition.